@misc{cryptoeprint:2014:558,
author = {Xiaofeng Wang, Chen Xu, Guo Li, Hanling Lin and Weijian Wang},
title = {Double shielded Public Key Cryptosystems},
howpublished = {Cryptology ePrint Archive, Report 2014/558},
year = {2014},
note = {\url{http://eprint.iacr.org/}},
}
You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.